Main Navigation Child Categories Disappear When Directing to https & SSL aMember Pages (Wordpress)

Hello there.

Our site, http://underwearsociety.com has an SSL certificate that I installed using a Wordpress Plugin and inserting the suggested code to into the proper file.

Is there a better way to make my sign-up pages and other aMember pages display as https? The method I chose seems to have locked up the child categories and drop down menu script in my Wordpress theme when calling the secure, aMember sign up pages.

I had to do a couple things to remove a strike through the https: prefix in Chrome due to the way their whole thing is set up. (eg; https://www.underwearsociety.com/amember/signup/index/c/jysXOK64G).

I'd like to avoid using a plugin (another one) if possible and thought it would be a good idea to check with you guys to see if there is a standard, easy, clean, and simple method for this.

Thank you for taking a look and instruction.