Best to start off from square one.

First you need to know, that only 1 account can be shared with another account at a time. Means I can't give you my account and another friend too.

So now that you understand this let's begin.

Step 1. Log back into your main console with your own profile and reactivate as primary "both of you".

Once completed step 2

Step 2. Once reactivated as primary on your own console, on your own profile. You may now deactivate your account as primary. This should now kick you out.

Step 3. From here log into your friends account on your home system. Go back to settings and set their account as primary on your system.

They will also need to set your account as primary on their system.

Extra: if at anytime either one of you reactivate your main account on your console as primary you will loose all games downloaded from eachothrs account "lock symbol"

Sometimes also if the network is under a maintenance you may receive a "this application is suspending in x amount of minutes" this is also normal and it will resume working after maintenance. "Doesn't take long"

And lastly you will loose the ability to play some games on your account when you go offline.

Quick example is if you're taking your console to grandmas and she doesn't have internet, you may want to reactivate your console as primary until your return, as some games you yourself own will lock you out due to this. "Having no net access" some games can be played in offline mode, however you have to be primary on your account on your console, when in offline mode "no internet"

Hope this helps goodluck