can a new president change who is in the seante when he becomes president?

I hope you're not an American...if you are, go to school.

No they can not the membership of the Senate is decided by voting in an election.
he only exception is when a member resigns or dies then the governor can appoint a temporary replacement until a new election can be held.

Of course not ......

The Senate and the House of Representatives are chosen by the voters in their districts, not the president.

Yeah, those Senate elections are only for shites and giggles. 

The VP can be the tiebreaker. 

NO - voters choose Seniors and Representatives!(Then again who knows - according to Trumpers, Trump lost due to a rigged election - if POTUS can be rigged [even though it was not] so can Seniors and Representatives)

No, he cannot.