How can I use flint and steel as my dimension igniter?

"

you disable the portal option then you add a custom procedure to the portal block to detect click events and check item if flint and steel check for blocks then place portal teleporter blocks with the if touching player switch dimension procedure."

Doesn't really help me. For example, how do you "add a procedure to the portal block?" And, "check item if flint and steel check for blocks then place portal teleporter blocks with the if touching player switch dimension procedure." doesn't make much sense.