I plan to buy PRS scheme through FSM.
But I am not sure, what is FSM role in this? Is it acting as the agent?

I know it sounds very no0bie, to which I am. Hence asking it here

I think it is just a reseller of funds......it is an online platform where it provides an avenue for UTs selection.
(sort of an agent that represent a wide range of FHs)
think of it like ...ebay, amazon or lazada......that provide added info like UT investment education, current insights and etc

You can see at FSM about us...
iFAST Capital is a holder of a Capital Markets Services Licence (CMSL) and is licensed by the Securities Commission to conduct the following regulated activities:

To deal in unit trusts
To offer investment advisory services
To deal in Private Retirement Scheme
iFAST Capital is also registered with the Federation of Investment Managers Malaysia (FiMM) as an Institutional Unit Trust Adviser (IUTA).

visit FSM website.

can get a lot info there