In the case of the performances you just need to record a performance, either from the record button in the dock of the table view, or the Record Performance button in the current table view. If you record a performance it is included in the table, so that when you share it, the performance is uploaded automatically.
Audio recordings are different, since they are uploaded to soundcloud. If you upload a table and then upload a soundcloud recording it will be linked to that table, also automatically.
If you need further assistance, don't hesitate to ask: