SSH

SSH to connect to a remote server.

GUI method?

Use putty for GUI method.

Login SSH with .ppk file on Terminal

Convert your .ppk to .pem file using puttygen.

puttygen JokerX_KEY_PAIR.ppk -O private-openssh -o JokerX_KEY_PAIR.pem

Now, login to your server using the .pem file.

ssh -i JokerX_KEY_PAIR.pem

Reference