On Linux server, you will have to manage your cronjob (cron job) via SSH.
crontab command is used to add/edit/remove a cron job on the server. Below are the few options of crontab command:
crontab -l – Displays the current cron jobs
crontab -e – To edit the cron jobs
crontab -r – To remove cron jobs
If you wish to edit it for particular user, you can use the following:
crontab [-u user] [-l | -r | -e] [-i]
If you are on the shared hosting and your hosting provider is offering cPanel, you can add/edit/remove cronjob from your cPanel. If you are unsure on how to login to your cPanel, you can refer our article on Secure cPanel Login.