The obvious way to do that is via cpanel file explorer... You should be able to multiselect folders and apply the change... You would think there is an option for recursive permission setting as with windows, however that also depends on your webhost backend system... I just checked one of my webhosts cpanel and the only way I can do it is to multi-select...
Alternatively If you have shell access to your server, you can chmod via the shell. Note: recurse with -R:
example: chmod 777 -R yourDirectoryName...
If its not available then I would request your webhost to do it for you if the file/folders are massive in number....
Hope that helps!