In the clip, Lohan is persuaded by Samberg to reveal the top-secret SNL handshake, which proves to be surprisingly simple.
Watch the promo below:
Lohan also resists temptation to refer to herself, Samberg and White as "the three musketeers" and scoffs at the SNL comic's suggestion that they are a "LiLo, J-Whi, An-Sandwhich".
The Mean Girls star makes her fourth appearance on SNL this weekend after a six-year absence.
Lohan told Late Night host Jimmy Fallon earlier in the week that she continuously called SNL producer Lorne Michaels to ask for the guest host role.
Saturday Night Live airs at 11.30/10.30c on NBC.
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Watch Lindsay Lohan promote her SNL appearance on Late Night with Jimmy Fallon below: