hey i didn't want to clog up the seasonal thread but to answer your question about calling act, you just have to do it once and you're good to go. the host will usually check through vms to see if the act call is warranted or not. lmk if you have any other questions!
go to replay.pokemonshowdown.com and search for the username of the person whose replays you are looking for. then, once you have found a replay you are looking for and have clicked on it, just copy the url and paste it wherever you want.