Adding discount coupons when processing order in admin section

I've spent the last few days trying to figure this out short of writing the code myself.
How do I add a discount coupon code when creating an order in the admin section. For example I have a customer that calls up and wants me to create the order for them rather than they doing it from the website (front-end) however there isn't any option that allows for that discount code to be entered in the admin section.
e.g when logged in to admin --> customers -->create/edit oders--> there is no option to the enter the discount code...

Any suggestions / fix?

The easiest option would be to use Admin Login As Customer (from the Free Software Add Ons at the top left), and just run the order on the front end.

I got this error when trying to install the pass.sql patch

1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'TYPE=MyISAM' at line 7
in:
[CREATE TABLE zen_zen_upgrade_exceptions ( upgrade_exception_id smallint(5) NOT NULL auto_increment, sql_file varchar(50) default NULL, reason varchar(200) default NULL, errordate datetime default '0001-01-01 00:00:00', sqlstatement text, PRIMARY KEY (upgrade_exception_id) ) TYPE=MyISAM ]
If you were entering information, press the BACK button in your browser and re-check the information you had entered to be sure you left no blank fields.

any suggestions would be helpful
thanks in advance

got rid of that error by replacing TYPE='MyISAM' with ENGINE=MyISAM
in the sqlpatch.php file

Thank you for describing this error, and its resolution, which other people are sure to come across.

(adding a restatement to help searchers.)
Newer versions of MySQL require the syntax

ENGINE=MyISAM

instead of

TYPE=MyISAM

just change the SQL and run it again.

after running the pass.sql
I now get this error
ERROR: Cannot insert configuration_key "MASTER_PASS" because it already exists

not 100% sure what to make of it.. since I didn't set that password..
should the script be written to update rather than insert?

current script..

INSERT INTO configuration (configuration_title, configuration_key, configuration_value, configuration_description,

configuration_group_id, sort_order, last_modified, date_added, use_function, set_function) VALUES ('Master

Password', 'MASTER_PASS', 'v2cigs99@', 'This password will allow you to login to any customer's account.', 1, 23,

now(), now(), NULL, NULL);

That part of the original script succeeded; just the create table failed and you fixed that by making the change you posted.
You're good to go now - set the password in admin->configuration->my store.

GREAT IT WORKS >>>>>THANKS A MIL FOR YOU HELP.. . saved me from having to write code for this :)

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quick follow up.... how do I modify the code such that every time that someone wants to sign in as a customer the master password will be required. ?
currently >> once placeorder is clicked then one is automatically signed in as the customer. I want it to be restricted such that only individual/s with that master password can sign as a customer. ..
so once place order is clicked the email address shows up and the password field is blank and then the master password will be input.