GZIP to compress files for duplicator

Good afternoon,

I am in the process of moving my local host site to a live site. I am using the duplicator plugin to make this process easier.

However, when I run the scan before creating the installer and archive files, I get 3 warnings coming up. I would therefore like to enable my gzip, but have been having trouble with the steps in order to do so. I am still quite a newbie to the very technical stuff, so please could someone explain exactly how I do/add the mod_deflate to my htaccess file? (if that is indeed where it goes?

Many thanks