Footer help

Good day everyone,
I am a real novice so please take it slow with me.

My site: https://www.isecsecurity.co.za

I see the footer is a logo linked to another website.
I tried to remove the footer under appearance > customize > footer copywright text

When I remove this: <img border=”0″ alt=”P.S.I.R.A” src=”https://www.isecsecurity.co.za/wp-content/uploads/2015/10/prisa1.png”&gt; Reg #2514992

It then puts in some generic text with links etc etc that I want to remove completely

How could I do this or find where to remove the generic text completely?

Many thanks
Craig