From the Dashboard select "Club Management". Followed by "Players.
Click the "Name" of the player you are working on.
Once the player is selected, click on "Roles".
Once here select "edit" next to the current Role or Select "New Role" in the top right corner.
Once you click "edit" a menu bar will appear for "Competitive Level" and Affiliate Name" select the correct affiliation and click "Save".
If another Role is needed to be added simply click "New Role", Once this is done you will select the correct "Affiliate Name" and "Competitive Level". After this is complete select "Add Role". You will now see both roles under this players account.
You will now see both roles under this players account.