A Lickd Creator subscription is valid for one channel.
If you have more than one YouTube channel, you would require a separate subscription for each.
When logged in to your Lickd account, you can switch between your channels within the My Account area.
This can be found by clicking your account picture in the top right-hand corner, or the burger menu (3 lines in the top right-hand corner) and then your account name.
From there you can switch between your linked YouTube channels, and create a subscription for each channel individually.