Good afternoon Tayyeba and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about some of the options not being available on your website.
I would love to help you with this topic.
As a first troubleshooting step, could you please provide us with your complete system information in a private reply using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
With that in mind, based on the description of your issue, it sounds like you might have a mixed content issue (when there are both http and https resources found on your site).
The temporary fix for now which is to update the Site URL settings in General → Settings in wp-admin Make sure you are using https or http in both fields.
You might also benefit from using this plugin https://wordpress.org/plugins/ssl-insecure-content-fixer/
While we are on this topic, I would recommend going through all of your CSS rules and make sure you are not calling background-images with the http protocol.
For example:
.site-header .widget-area {
background-image: url(http://friendsjmz.wpengine.com/wp-content/uploads/2016/03/lt-blue-highlight-up-e1459375466983.png);}
Let me know how that goes.
Best regards,
Geoff B.