Your tractor appears to be open center, and if the BH has an open center valve on it, it should be no problem to connect the BH.
You need to know the flow path of the hyd fluid.
Somewhere at the back, there is a high pressure hose going to the 3pt .
A manual would be good to have.
You need to insert the BH valve is series with the flow path.
You probably need a QD's for the high pressure hose at the back, and a QD from the BH PB port to complete the flow to the side of the tractor for the 3pt.
When not using the BH, you would just plug the two QD's together and have your normal hyd flow restored.
Something like this.