Hi Drybonz,
If you put the looper in the "pre" position (when you engage the looper, one of the buttons allows you to swap between "pre" and "post, look at the user manual for more details) then it records your signal BEFORE any effects (i.e. it puts the looper at the beginning of your effect chain).
Record what you want, and you can set the looper to repeat continuously or you can press the "play once" button. Again, it will be easier for you to read the manual to figure out how to use the looper. It's pretty easy to use.
When you tweak settings or change patches, the looper playback will change accordingly (assuming it's in the "pre" position).
By contrast, if the looper is in the "post" position (at the end of the chain) it will record with all of the effects and will not change as you change effects or patches.
There is a limitation with this - you can only record one lick/riff at a time (it can be over-dubbed, but each dub just plays on top of the previous dubs). It is also not saved if you turn off the power, so you'll need to keep power on as long as you are tweaking or re-record the lick if you turn off the device.
Hopefully that makes sense.