Adding gallery blocks, for slideshow on 7.1

Site URL: https://www.lellasoper.com

Hello,

Please help. Im trying to add a gallery block and when I follow the steps on the help page :

1. Edit a page or post and click an insert point. For help, visit Adding content with blocks.
2. Scroll to Gallery in the menu and select Slideshow, Carousel, Grid, or Stack

I don't have an option for the gallery in the menu? Therefore I can not select Slideshow.. why is this? and how do I work around it.

I know this is very simple, however I have filled the steps over and over and I still is not appearing the same as it does on the help page...?

Thank you,,

Lella

1. Edit a page or post and click an insert point. 
2. Scroll to Gallery in the menu and select any Gallery
3. Edit Gallery > You can choose Slideshow, Reel, Grid...

I managed, just was a different way for some reason. Is there a way to remove the site header & footer panel so website can be full screen?

Add to Home > Design > Custom CSS

header#header, footer.sections {display: none !important;}

Thank you! Now I would like to move the menu from the header to the middle of page like so: see where is says "info & contact"

I also would like to move my slideshow gallery to one side rather then having it in the centre, how do I do this?

Can you share link to page in screenshot? We can check easier.