You don't have the correct mods as someone elseMaybe you do see at least one player in the list I linked but still don't see them in-game. You may not be using the correct mods. Just look at the mod(s) the players are using and drag the corresponding mods to your launcher's executable. You'll find the other players unless you made another common mistake that's so similar that it also deserves to be numbered 5.
#5 part 2
You don't have the correct mutators as someone elseYou have the same mods as the other players but you're still somehow separated from them. In your launcher's Mutators tab, check to see if they match the ones shown in the player list. If they don't match, you'll be put in a different room.
Bomb icon = Allow Explosions
Police icon = Cops and Robbers
MirrorMode as the mod used = Mirror Mode
NoCheats2 as the mod used = No Cheats
You messed with the textboxes in the SHARMP launcher's Server tabThose textboxes in the SHARMP launcher's Server tab should remain untouched as they don't mean anything. No one has a clue why it's there if it's never going to be used, but they should be left alone. Those textboxes are doing something. They're just currently useless. There's only one server that SHARMP can connect to, and the launcher's settings already default to that server.
No one actually plays SHAR MultiplayerThere just isn't anyone playing Multiplayer. We're a small modding community, so having 4+ players in a single session is very rare. Unless you're lucky enough to find someone hosting an event in SHARMP, you won't find yourself playing with many people. There's another good reason why it's always so empty. See #1.
SHAR Multiplayer sucksEven Donut Team agrees with this one. Despite how many people join the Discord to request others to join them, there's a reason why they don't return: SHAR Multiplayer is boring. There's nothing to do in it besides ram each other, circle around the maps, and spam the explosion key. No missions, no destructible vehicles, no CPU players, and no convenient way to change characters. Players will soon realize SHARMP's major flaws when trying it for the first time, and they won't come back to it the next day. You won't see Donut Team improve it any time soon. Pray that they start working on it when they finish Donut Mod 4