For statistics collection I recommend to do two things:
- with right-click on your B5 from devices list select 'Collect device statistics' and enable it;
- with right-click on your B5 from devices list go to View -> Interface summary, or Port tree, and over there you can right-click on the port and select 'Collect interface statistics' option.
Please remember to have correct SNMP credentials on both sides.
I recommend you to bookmark the XMC manual, which is also publicly available online: https://emc.extremenetworks.com/ - you will find a lot of other useful things inside. 🙂