I installed it myself.I ve been making all the changes but thats the only change am unable to make.

This is the free version.i was trying it out before i go for pro versions.

Is there a plugin i could use to install it or anything else i can do to install it or guide me on how to re install it correctly
I really want to give it s try.I dont want to change to another theme.
Do othery plugins affect it
I have magic action box,contact form 7,social plug,social media plugin,