I can help with some things, but for one on one help it’s best to reach out to support@singularsound.com for assistance. You can also read our manual which details how to use the app.
To keep it brief, when in the My Custom Modes page, create a new mode, then, you will be asked whether it is based on the Aeros or BeatBuddy Default mode or if it will not be based on a template (‘Blank’).
Choose BeatBuddy, then, you can rearrange buttons within their current pages (there are up to 10 pages) by pressing and holding to drag and drop them where you want them.
You can open any button up and edit the commands being sent, and, if on Android, can re-arrange the commands in the list.
Let me know if you have more questions!