Thanks.
Plugin provider has given the list of functions and I am adding them using Code Snippets.
eg.
add_filter(‘frm_setup_edit_fields_vars’, ‘frm_set_uri’, 21, 3);
function frm_set_uri($values, $field, $entry_id){
21 is the priority mentioned in the add_filter. So, I should make the Code Snippets Priority as 22 ? Please clarify.