In RME, go to RME > Devices > Device Management > RME Devices and click Add to add a new device from DCR. The exact interface in DFM depends on the version, but it will be found under DFM > Device Management. In Campus Manager, assuming you have no Data Collection filters setup, simply run a new Campus Data Collection to sync the device from DCR.

I have done all of teh above and the device still appear in DFM as questionable and its under a folder called Insufficient Credentials

Then this indicates that the SNMP credentials in DCR are incorrect. You should start a sniffer trace on the LMS server filtering on udp/161 traffic to this device, then rediscover the device in DFM. The trace should tell you what SNMP credential is being used. In order for RME, DFM, and Campus to do their initial data collections, the SNMP read-only credential must be correct.

I have my community set to RW should I also have a RO setup, I have double check it is spell correctly and have actually copy and past it form a file in both location Comon Services and in the device itself

Yes, you must have a RO community defined in DCR. It can be the same as the RW, but that field must NOT be blank.

That was the problem,it just came on, funny some of them worh great with just the RW