I'm not sure what's best--at that temp algae won't grow, so you may want to simply wait till the water passes the 55 deg. mark, and then add chlorine.
What you can do is walk around the pool dribbling a little as far in as you can reach, trying to get the bleach as naturally distributed as possible. If you have a submersible sump pump you can put that in to circulate the water.
But I really would wait until the water warms up to add chlorine. At 38 deg algae shouldn't grow.
Poconos may be able to give you better advice than me. Al?
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