Ok, there are two different meters that you have to watch.
You have to watch the meter on 'the way in'. While your recording, your audio is turned into numbers.
The scale goes from minus whatever to zero. If your preamp exceeds zero the converters can't plot the info, so they just cut it off flat at zero.
That's digital distortion and you can't fix it later.
If that's what's happening then just turn down the gain down until you have no distortion and then re-record.
In fact, turn it down more than that. Leave room. Your input should be peaking at maybe minus 6 to minus 12 or so.
The second meter you have to watch is the output meter. When all your stuff is recorded and you hit play there's a master meter to tell you how loud it is the mix is.
The same applies...go over zero and it gets clipped.
This is fixable - All you do is turn down all the faders in your project.
Again, leave room. Have your mix peak at minus something.
If your meters are green - yellow - red, aim to peak in the yellow.