Ampeg SVT-CL effects loop help

[Jason Wilson]

I have an Ampeg SVT-CL head and also a Boss GT-10b effects unit.
My guitarist told me the effects unit will sound better if I use the effects send & return, but when I look at the back of my head I can't seem to see where I would connect this way?
Does it have it? Can it be done?

Does it actually sound better? At the moment I am just plugging my bass into the units input and then from the effects unit output into the main bass input on the amp.

Not to sure about effects loops as I have normally just used pedals & connected them the same way I am doing currently.

Any help will be appreciated.

Cheers

[B-string]

Preamp out would be the same as effects send. Power amp IN would be the same as effects return. Don't know if will sound any "better" or not? Most likely won't sound any different.