It depends on exactly what your account is with GoDaddy. Most of the cheaper, shared hosting, cpanel hosting accounts GoDaddy do not allow you to install your own certificate. So we can talk you through obtaining a certificate, I’d suggest checking with GoDaddy first though that, if you obtain a certificate. can you install it on the account.
Read a lot on their communities about people not being able to use LE on GoDaddy, probably too scared to lose sales of their own SSL certs. Had to go there because of a problem with the .hosting registry and a domain I purchased and saw lots of posts there about LE.
A) Are you using GoDaddy WebHosting Services?
B) Do you have a control panel (i have not used godaddy for a while but i remember there used to be an interface to manage certificates)
C) there are lots of clever people on this forum who can help so please explain the problem and I am sure someone will have a good solution