Hello I have a table in access with colums:
ID - Autonumber
Username - Text
Display Name - Text
Auto - Hyperlink
You can either
Use a Calculated field in your table (instead of a hyperlink field). Set up the formula as
="http://example.com/user=" & Username then on your form, when you bind that column to a text box set Format > Display as hyperlink = "Always".
Leave your table as is but in your form add another textbox and set the Control Source to
="http://example.com/user=" & Username and same Display as Hyperlink setting as above.
Then, which ever of those you chose (though I favor the second), on the On Click event of your textbox you have
FollowHyperlink me.textBoxWithURL ClipBoard_SetData UserName
ClipBoard_SetData call is from the windows API. Microsoft provides all the example code for using the API. Just copy/past into a blank module and use
ClipBoard_SetData as needed.