Very small dill plants can be transplanted carefully.
Carefully meaning not to disturb the
root system.
Dill has a long taproot and normally does not relocate well.
It is best seeded in ground where it will live.
Keep in full sun and cooler temps.
How tall is your plant?
How large is the container?
I'm not sure what your zone is but dill is an annual.
Lower leaves yellowing is normal.
In a container, you will have to be careful to provide adequate water and yet not over water it.