[Copied from DnD Beyond]
You retain the benefit of any features from your class, race, or other source and can use them if the new form is physically capable of doing so.
[Copied from PHB]
I could not find anything indicating that you could or could not switch forms while in beast form to another beast
This sentence. Whild shape is your class feature that doesn't have any specification on what you need to do to transform. Therefor by RAW you don't need to do anything other than just announce that you are using this ability.
