Hello philip ,
Can you explain us what kind of navigation do you want to add? Maybe explanation with images will make it easier to help you.
Or do you mean navigation like post navigation in single post (previous and next button at below the post)?

Thank you.

Thank you for the reply, Please look at this:

https://prnt.sc/ke3e4z

So the issue I have with the template on screens wit smaller Resolutions You do not see the bottom Scrolling navigation.

http://rentcore.co.za

So some of the resolutions I have tested.

On :
a. 1280 x 600 larger up to 1080p the Menu I’m using is sticky,
b. 1152 x 864 and smaller the menu scrolls.

a. the Smaller resolutions from less than 1080p the menu is sticky and gives you this:
Screen resolution – 1280 x 720
http://prntscr.com/ke4qnz

b. if its 1152 x 864 and smaller then the menu is not sticky so you have this screen :
Screen resolution – 1152 x 864
https://prnt.sc/ke4s2v

Hope it makes sense.