It's just about impossible to give written directions around the Wyre Forest as nothing is signposted.
Starting from the two car parks at Button Oak, just keep turning right whenever you can without actually leaving the forest. This will keep you following the perimeter, mostly on decent singletrack.
When you get to the railway, head for Bewdley. Look for two steep drops to the left close together, just past the family cycle route on the right.
Follow either one down to Cooper's Mill footbridge.
Over the bridge and turn right.
At the start of the concrete road there are two tracks on the left.
The first one, over the stream, is Camber.
The second one, which ends in a very steep drop, is Three Bears.
Both these are much better ridden downwards, so either struggle up them or circle your way round to the top.
If you're riding from Stourbridge, the canal makes a good off road route. Follow it almost to Stourport, then over Burlish top to the end of Bewdley bypass and in to Bewdley along the river.