can you people help me? it keeps saying i need to "mount" something.... idk....

Make a directory called "DOS," put Arena in it, then go into DOSBox and type:

mount c c:\DOSc:cd arenaarena

ok, i made a folder, put arena in it, typed what you told me to type, but its saying "Directory c:\DOS doesn't exist."

Where is your DOS directory located?
Since it's actually:

Mount c [drive where arena is located]:\[directory arena is located]c:cd arenaarena

So Taemos' functions only work if the Arena folder is placed in a folder called 'DOS' on drive C

For example, if you placed Arena in a DOS folder, which is in turn located in a 'Games' folder which is located on drive D, it would be:

mount c D:\Games\DOSc:cd arenaarena

Right. I forgot to mention that the "DOS" folder would have to be on the root of the C drive (C:\DOS). Arena then goes in this folder (C:\DOS\Arena).

I tell everyone to mount a main DOS directory because it's quite possible to do harm to your system through DOSBox. If you type in the wrong command damage is limited to the DOS folder since DOSBox sees that as your main C drive.