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If your website is hosted with GoDaddy then this should be the right set of instructions:
https://uk.godaddy.com/help/manually-install-an-ssl-certificate-on-my-cpanel-hosting-12027
the title of your question suggests that you already did some configuration for HTTPS - either requested your web hosting provider to enable it for you or did some configuration yourself.
If not then it's really hard to provide a meaningful answer as the "how" depends on what technologies and providers you use.
If I step back - enabling HTTPS doesn't have to disable HTTP. You can have both options at the same time. If you don't want that, you need to configure a "redirect" so that your website always responds with HTTPS.
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I've worked around (not only) SSL security for over 20 years in enterprises and startups.
I am now running an HTTPS expiry management service KeyChest.net
Can you share your domain name?
In general, there are 2 steps (unless HTTPS is offered by your hosting provider):
1. obtaining a new certificate - you need to request a certificate from a Certificate Authority
2. install the certificate on your website - it means copying the certificate file to a certain place and updating the webserver
If your website is hosted with GoDaddy then this should be the right set of instructions:
https://uk.godaddy.com/help/manually-install-an-ssl-certificate-on-my-cpanel-hosting-12027