Hi,
Assuming you are using the drag & drop editor you can use the button block to achieve this. You just drag it into your email.
You can use the dynamic content tags in the url of your button. When you select a text area in your email you see the dynamic text options in the right hand panel. Select one and the tag is shown at the bottom of the panel. You can use this in your url.
So, you could contruct a link something like this:
www.example.com?user={usertag:name|info:receiver}&usergroup={usertag:groups|info:receiver}
The tags will be replaced with the actual values when you send your email.
