First of all; Vesta CP supported this OS; RHEL / CentOS 5, 6, 7 Debian 7, 8, 9 Ubuntu 12 . 04 - 18 . 04
Minimal system requirements RAM 512 Mb HDD 20 Gb CPU 1 Ghz
Not lets start ; Step 1; You have to download PuTTY for login your VPS. its free. you can download https://www.putty.org/
Step 2; open PuTTy and login with your VPS IP address, it will be open new page and it ask to you login, login : root Password : "your password in your VPSserver panel"
Step3; Write commands, there is; 1. apt-get install curl 2. curl -O http://vestacp.com/pub/vst-install.sh 3. bash vst-install.sh --force 4. it ask to you "starting setup" and you will write "Y" 5. it ask to you mail address (your vesta panel password send to this when ending setup) 6. it ask to you domain, yourdomain.com 7. it takes a few minutes and you will receive a mail from VestaCP, inside your login informatin 8. https://yourserveripaddress:8083 9. Then you can login