How To change an FTP account’s quota
To change an FTP account’s quota, perform the following steps:
1 – Open cPanel (yourdomain/cpanel).
2 – Click on (FTP Accounts) from Files section.
3 – Click Change Quota for the FTP account for which you wish to change the quota.
4 – Enter the disk space quota, or select Unlimited.
5 – Click Change Quota.