sounds like you are forming a partnership, and once in place and agreed to by all parties, in writing, the only way to change it is a new agreement signed by both parties

Say a person writes up an LLc operating agreement. Can that person go back and change the terms of the operating agreement at a later date?

you are "playing around"--what is the purpose of your LLC?

and your company?

I can help

the LLC is much better operated after the company has been

a partnership for 1-3 yrs first...........

If all parties agree, yes. It happens all the time.

Get a lawyer.