The most important question, as you never stated it:

is this a multiplayer setup?

And if it is:

You have to create both players on the server.

Then you have to assign actions on the server (one for each player), that
have for example a while(1) {....}
loop, that can react on key-inputs, and thus move the player it is assigned to.

To controll the player from the client, you have to send movecommands to the server

use send_var(); on the client.

for example:

var player1_forward; //variable

...

if(key_w){player1_forward=1;send_var(player1_forward);}

...

in the action (run on the server):

if(player1_forward){ent_move ..... player1 ... ; player1_forward=0;}


Post your code, if you have no Idea what is wrong with it.

Also try not to get into multiplayer, if you have not enough practise
with singleplayer code.