why cant i add html coding on my website?

my website ws made by cubecart...and i have a banner on it from new look which i get paid for hosting each month. theyve emailed to say its offline and to change it to another from their trademover.net account.... so ive got this but when im on the homepage to edit and add the link, it wont let me add it.... im sure i asked this last time and got told to click "source" which transfers the page to the html codes already on it.... ive done this but it wont let me paste ...its like the paste option on the tool bit isnt clickable..and i cant right click and paste....
any suggestions how to add this link?
i just typed it all in and it disappeard and nothing showed

and i dont understand ftp etc...i only know basics..i never made the site.... noone can edit my site nomatter what i used...i go into my admin...to bring the homepage up with all the html coding..i then try to paste the html link in but it doesnt let me.....ive worked it before as i already have 2 links in that section..so there IS a way of doing it..and clicking source was one way
ive managed to just type it all in and it shows now
 
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