* "Free" as in "free to go": This would be signed with the sign for "free" which is a twisting motion of the hand from the wrist.
* "Freedom" as a concept: This could be signed with a combination of signs, such as "independence" (a sign involving both hands moving upward), "no limitations" (a sign with both hands open and moving outward), or "choice" (a sign with the dominant hand making a choice gesture).
The best way to sign "freedom" is to use a sign that fits the context of the conversation. For example, if you are talking about political freedom, you might use the signs for "independence" or "choice". If you are talking about the freedom to do something, you might use the sign for "free".
It's important to remember that sign language is a visual language, so you'll need to pay attention to the facial expressions and body language of the signer to understand the full meaning of the sign.