Use a flat object like a bank card to avoid bending the solar panel.

This Waka Waka has been opened up previously. Since the solar panel was originally glued in place, the solar panel was re-attached using double sided tape. When putting your Waka Waka back together, you could either choose glue or double sided tape. Both work fine.

Now replace the solar panel and rebuild the Waka Waka in reverse order. Useful tips for re-assembly will be given in the next step.