RV-7/9 Center Sub Panel

I have ruined my F-7105 Center Sub-Panel trying to get it onto the Center Forward Fuselage Rib (F-7108A/B). I have ordered a new panel, how does one get it onto the rib? BTW. This is a Slider. I think the Tip-up has a different forward fuse and so does not apply. Thx. Rolly Clark RV-9

just spread slot in pannel for and aft place rib vertical and slide bottom lip into slot then rotate rib to horozonal tough to describe hope this helps.
bob mcmillin RV-9 canopy