Bcells are involved in the humoral immune response. the flowchart below summarizes the steps involved in b cell activation.

I think what you need is to determine what are the steps or label them, so let me help you with that. Here is the order of the steps involved in b cell activation:
- First a B cell encounters an antigen recognizing the antigen receptors then internalizing the antigen by a molecule called MHC.
- Then a helper T cell is activated and recognizes this MHC molecule or antigen fragment and binds it to the B cell. The interacton is the one that activates the B cell. 
- The B cell proliferates into plasma and memory cells. Plasma cells create antibodies.
- Memory B cells help in the secondary immune response if the encounter the same patogen

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