if so how do i do it
to a large degree it depends what precisely you mean by "share"
FamilySearch is free - and any data (for deceased) in FS is "public" in a general sense.
So think about what you really are asking by "share" - -share in what way?
You can/could transfer data between different sites
there are numerous things to consider though - among the primary - What is your main intent in doing so?
some food for thought :
if you have your family data in 3-4 different places on the Internet - how will you be able to keep it all in sync??
Would you always use one database as your primary database and only use that database for data input?? and then desire to have it somehow "flow" to other sites?
If you are entering family data in all three places - it would become a nightmare to maintain.
There are various possibilities to you question/answer - and no single one right answer.
I'm sure others will share some details as to how you can indeed transfer data.
But just THINK before you JUMP - so you dont end up with a bear of a mess
plan it out well and ponder on the whys and hows of how all the parts and pieces will work together.
with your answers to these questions - we can give you some more detailed and focused answers.