Please help me domain,dns,cloudlfare

please help me, it is a mess and i am very confused, i have a personalized domain and registered with hostgator, when i joined your web hosting “infinityfree” i was given the choice to have a free url with domain like for example " … epizy.com “and now I want to change this” futurebundles.epizy.com “for” lojafortnitept.com "without redirects, just change it but at the same time I would like to have the cloudflare protection service protecting the site, it would be possible ? Can any admin log into my account and do everything right without any error? If not, I will tell you everything for now and then fix it, I have your dns servers pointing to “lojafortnitept.com” on hostgator and also activated by cpanel the cloudflare service, if it is on the cname tab there is no record there, should it? then i would also like to have a SSL / TLS certificate with the cloudlfare service but first everything would have to be working (I think) Video showing everything i said: