Hello ​@Tashi, 

Mikaella here from Slido -  happy to help!

If you need to edit your slido slide presentation, click on the slide with your slido poll and the sidebar should pop up for you with that poll question.

You would need click on the ellipse or three dots (...)  to make edits within the slido sidebar of your presentation. I hope this helps!

Let me know if you have anymore questions! 
My best, 
Mikaella from slido