Hi Albat and Dreakman
Sorry for the late reply.
After installing "user profile advanced" plugin, make sure it is enabled on the Joomla! plugins list. You need two fields - the one which already contains the data you want to capture, and the one you want to insert this existing data into.
Go to your Form and Content Type/Site Form. Go to the field you want to use, click button "2" (live + live value). Under live list dropdown, select user/profile-adv. Click configure and in the modal popup, enter the name of the field whose values you want to capture in "properties". Save and close modal popup. Save content type.
Note that you must enter the name of the field correctly or it won't work. It will throw an error "No Such Field".
I hope this helps
Regards