how to set this "move-blogs.php line 21"

hello how do i set this line?

move-blogs.php

line 21
$newdb_prefix = 'newdbname'; //This is the prefix of the db's you're moving your tables into - we assume they are all the same, if not, you're in trouble

my new table prefix is "wetle_dasdf" do i have to add " wetle_global" to that?