You do not my friend, just click "Add on IM" and a pop up comes up. Click confirm to add me and wait till you see a lobby button on the left hand corner. Click on the lobby sign (might say chat sign in some cases) and chat with me through there .
In some cases it won't allow you to add me, wait till you see the lobby sign and then click on "Add on IM".
If you have any questions, feel free to ask me!