Hi!
Your hosting company must have given you the details to log into your account (like server name and password) and probably a separate FTP password.
Then you have either a dashboard/admin-panel where you can directly upload and change your files and folders. Or you would have to use some FTP software like ‘Filezilla’.
Good luck.
I didn’t have Akismet activated when I tried, so this shouldn’t be the problem in general.
One solution that I came across when searching, which helped other people, was to assign yourself more memory for PHP with your webhost. One way to do that seems to be one line of code to the php.ini file. And the other I forgot. Maybe you can google that?
Good luck!