How do I use ApeX VPN?

Could you please elaborate on the steps involved in utilizing ApeX VPN? I'm particularly interested in knowing how to set it up on various devices, whether it's a desktop computer, a mobile phone, or a tablet. Also, are there any specific protocols or configurations that I should be aware of for optimal security and performance? Additionally, how does ApeX VPN handle connection speeds and stability, and is there a way to monitor or troubleshoot potential issues? I'm looking for a clear and concise guide to get started with ApeX VPN.