NEED PLUGIN HELP!

Then you didn't set the modify world perm correctly. If you had, people would be able to break blocks.

Thanks i got the commands to work but the only prob is that people that are not op can't
break any block that is in the world they can go as far as they want but they can not break any block Thanks for the help with the commands

^Do that. If that doesn't work. Do you have EssentialsAntiBuild? If you do, remove it

Here is an example of some permissions then. They all follow the same basic spacing pattern, so follow them and add in permissions as needed. Inheritance describes a higher rank gaining the previous ranks abilities so you don't have to type them twice. Negative nodes describe things you do not want that rank to have. If the next rank inherits the previous rank's permissions, you will have to type the positive node in the next rank if you want them to have it.

Also, essentials.warps.* gives users permission to use all created warps. If you want to restrict some warps, use essentials.warps.[warpname] to give permissions for specific warps.

Another helpful thing is the Essentials Command Reference.
http://ess.khhq.net/wiki/Command_Reference

groups:
default:
default: true
permissions:
- essentials.spawn
- essentials.sethome
- essentials.home
- essentials.warp
- essentials.warps.shop
- -worldedit.*
- -worldguard.*
- modifyworld.*
admin:
default: false
inheritance:
- default
permissions:
- worldedit.*
- worldguard.*

Are you using Essentials and PEX?