If you've followed the instructions correctly, there shouldn't be anything else for you to do.
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Android instructions:
1) Get any file manager, “X-Plore” for example https://play.google.com/store/apps/details?id=com.lonelycatgames.Xplore
2) Navigate to Internal storage/Android/data/com.lizzy.jpde/files
3) Create a 'game' folder.
4) Paste the RPA file in there.
PC/MAC/Linux Instructions
1) Download the RPA
2) Paste it in the 'game' folder.