You can set A record for your domain to point the domain to the server where you have hosted your website. Before setting A record, ensure you have hosted your website and set the Nameserver. Please referNameserver host a website and point to the domain.
Are you looking to set A record in SolidCP? Please refer to the set A record in SolidCP.
Are you looking to set A record in cPanel? Please refer to set A record in cPanel.
Are you looking to set A record in Plesk? Please refer to set A record in the Plesk Panel.
You can also manage your DNS A record from your Domain registrar directly if you are using their nameserver.