One of the many things web visitors check is a site's SSL certificate. If you want to have your sign-up page secured follow the instructions below.

Your domain yourcompanyname.ositracker.com. This is already a secured link included in your package.

To make your custom affiliate sign-up page secured, please register an SSL certificate, like namecheap.com.

Send it to support@osiaffiliate.com and indicate the request for a secured custom affiliate link. 

You may also refer to this article for additional option:

Use a FREE Cloudflare account and secure your custom domain

Note: Once you secure your CNAME, send a request to support@osiaffiliate.com so we can update the URL on your thank you page.