Does DART or TRE connect with Greyhound Bus Station? If not, how does one get from DART or TRE to the bus station?

You can actually connect between Dart and Greyhound in Dallas without coming to Fort Worth. But if you want to connect to the Greyhound bus station in Fort Worth, once you take the TRE to Fort Worth it pulls into the same station that Greyhound uses. You just have to go inside.

Walk off TRE at Fort Worth station to your right is the building, go inside you will see Greyhound station.

Every time I bend it wasn't any line

The TRE is the same address as Greyhound is. I don't know about the Dart other than it's in Dallas and the TRE runs there.

Yes it does.