USER FORM - Returning the values

Hello!!

I have created a user form to enter certian values in certan cells in a workbook. But I would like to add two more functions to my user form. I would like to set a user form to do a search for a certian value and then to fill all other text boxes with appropriate values. Also I would like to be able to modify fileds.

For Example, prefered trigger is Account number, so if i enter account nuber in text box and click search, I wold like to have returned values connected with this account number or if I press modify i would like to change certian field based on entered account number.

I must tell you I'm not an expert in VBA, this user form was downloaded and I done some changes on it.

In attach you can find this user from, I would appriciate if somebody can help me to add those two functions.

Thanks in advance
Milan