Okay. I hope this helps others.
I always wondered how I could watch my YT playlists/subscriptions.
Farvoice's YT module has the ability to configure a YT username.
That way the module knows what playlists and subscriptions to show.
In my case I had an issue: I log in to Youtube using my Gmail/Google account.
I used to have a normal Youtube account (before they were bought by Google) but one day, while logging in to Youtube, it must have asked me if I wanted to link my regular YT account with my Google account and I must have answered "yes"...
Soooo...if you link your regular YT account with your Google account you will no longer be updating your regular YT account's playlists, subscriptions, etc.
That's not too bad. So what's bad? Yea, the bad part is that in order to watch/play your up-to-date playlists/subscriptions you need a Youtube username but since you're logging in with your Google account, there's no YT username.
=== Attention ===
You can only choose/create a Youtube username
once!
Be cautious to choose the one that suits you best because
later you won't be able to change/edit it.
Can I change/edit my YouTube username?===============
What you need to do is log in to YT using your Google Account, then click your name or your avatar on the top/right corner of your screen.
A list comes up with some options.
Click "My Channel".
Click "Channel Settings".
Click "Info and Settings" tab.
Now you can see that there is a "Channel URL". There must be a button to edit it's URL. Click it. Change the URL to something similar to your old username or to something that you can easily remember and that suits your profile.
There! Now you have a username again: it is your channel's new name.
You can now use that channel's name in Farvoice's Youtube module.
Hope it helps.
Cheers
EDIT: I got this idea from this FAQ entry -
How do I find and create my YouTube username?