When at https://play.alienworlds.io, click Mine to access the Mining Hub.
Once in the Mining Hub and once you have selected your land and tools, click Mine to begin to mine.
When your mining is completed, you will see and be able to click on Claim to access your rewards. Here you can also see the commission of the land you are mining on, and can change land if you are not satisfied at this point.
When you click claim, the WAX cloud wallet pop-up window will appear, asking you to sign the transaction.
And finally you can see the amount you have mined. This can vary depending on many factors like land type, tools used and planetary Trilium pot at the time. That is why we don't show a specific number here.