What you need to do to start mining from the wallet?
If you are synced. Just open up the console by going to > Help (on the wallet top bar) > Debug Window.... then in the console type "setgenerate true" (all cores)
That is the default which will start all your CPU's cores to mining directly from your wallet. If you want to use your PC at the same time I suggest only using half the cores your processor has.
The # Processor cores varies considerably depending on a bunch of factors, I would google yours to be sure. But in my experience I have been okay doing it as such:
i3 = 1 or 2 Cores "setgenerate 2 true"
i5 = 2 or 3 Cores "setgenerate 3 true"
i7 = 3 or 4 Cores "setgenerate 4 true"
And the Default "setgenerate true" -- starts all cores.
To stop the miner - "setgenerate false" == edited post to add this in Lawls, kinda important if you wanted to switch between # of cores.
Dont type the " " obviously.
and we should have three mute nodes up in an hour or so. 
