User permissions and rights on centos

you need to make the user owner of that file

to make the owner :

use chown

chown -R user  foldername   [ here -R for recursive ]

it wil change the owner ship

then give the read and write permision over that folder or file

by chmod  -R 755 folder name


http://www.cyberciti.biz/faq/how-linux-file-permissions-work/   : file permission  

how to use chown command to change owner shop

http://www.cyberciti.biz/faq/how-to-use-chmod-and-chown-command/   



you can use chgrp commadn to change group owner ship,

sorry too much link , but just have a read

http://www.tuxfiles.org/linuxhelp/fileowner.html

for chown and chgrp for changing file permission

Isn't there another way to do it

I'm giving someone access to my webserver, so he can fix some stuff ...I don't think is safe to make him the owner of the whole website.

Maybe create a "support" group with these rights and add this user to this group?

but then again I don't know much about it

Why not use ACLs

By using ACLs you can give someone specific permissions regardless of Owner,Group and others

for example you can give Mr. Fix   rwx excusivly for Dirs or Files you want

To implement acls its fairly easy

setfacl -m u:john:rwx /var/www/html/test

This would give user John rwx on the file test without changing anything with chmod or owner or group
Do man setfacl and check examples at the end of the page

To view acl on a file

getfacl filename

Good Luck