Activating FREE SSl

Can anybody help me activate my free ssl for my website?

What free SSL are you referring to? SSL is enabled on all sites by default.

Certificate to convert our website from http to https.

@JULIAN said:
Certificate to convert our website from http to https.

Converting a message from http to https does not depend on a certificate. You just need to setup a redirect: https://infinityfree.net/support/how-to-force-all-traffic-to-https