How would you make a targeting system? and how to change players?

[Title]

Hey I'm new to Clickteam and was wonder how to make (or if you can) targeting system kinda like the one from dark souls 3

What I want it to do is... I just want I simple target lock (For projectiles of course) when you click on the _ (Some active) as well as more dark souls one where you press a button and it auto finds closest target that you're facing

Update: I would also like it to be able to switch targets

I also wanted to know how to change players (I couldn't think of a better way to word it) for instence when a press _ button it will change your player to the "target" i found a way to change players by using player 2 and ignoring/restoring controls but I don't like using player 2 and I don't know how to make it on any active (Well I haven't tried much so ya)

Note: Ya ik I didn't (Well I used some) use any punctuations I just don't (i use ' out of habit but I don't think there useful ether) like to use em besides "!" or "?" for the must part I don't see much use for em (For what i type) but if you do see a thing I need to use em for let me know and yes ik they can be useful

Note about that first note: I sed that because why not and I wanted to complain

Note about I: Ya i don't think cap i is useful ether (man i just felt like to complain about grammar today)

Note about my horrible grammar: Ya ik long as you understand its all good right? (A lot of people think its not all good) and if you don't understand just ask

Note about me making a bunch of notes: Im bored

Note: Holy crap this is getting long ima stop

[zip2kx]

Well this was a weird post lol.

The Dark Souls system is a bit complicated, you have to use math to calculate which object is the closest, there are examples of that in the forums but you will have to do your own research on that one.

The click targeting isn't too hard.
I'm guess you have an enemy object, some sort of marking object that highlights the targeted enemy and a bullet.

-When user clicks on Enemy object
+User mouse is over Enemy object
+Enemy Object flag 1 is off
=toggle enemy object flag 1

-When user clicks on Enemy object
+User mouse is not over Enemy object
+Enemy Object flag 1 is on
=toggle enemy object flag 1

-When Enemy object flag 1 is on
=set position of Target Marker to Enemy Object

-When Player presses space button
=Launch bullet in direction of Target Marker

[Title]

Thanks for the reply and ya its a weird post xD

Note: Sorry for the delay (I thought it would email replies xD)