No. You cannot create additional logins for your cPanel shared hosting account.
However, you can grant others access to your account by letting them log in to cPanel directly, bypassing your customer account entirely. The direct cPanel login URL is:
http://coolexample.com/cpanel
Where coolexample.com is your domain name.
From here, they can log in using your cPanel account's username and password. If you need help finding those, see Reset your FTP password.