I’m sorry to hear this, @Inbar!
1. Can you share the exact value you are trying to use for the Community Events redirect URL? I tried a simple value in URL format and it worked fine. Here is a screenshot of the value I am testing. It saves fine every time:

2. Is your whole site is in Hebrew?
3. Can you please post your site’s “System Information”? Here’s how: https://theeventscalendar.com/knowledgebase/sharing-sys-info/
As for creating custom templates, this is something that we unfortunately cannot help with in support.
But you can learn how to do it by using our Themer’s Guide, available here ? https://theeventscalendar.com/knowledgebase/themers-guide/
Check out that guide, and then respond to the three items aboveālet us know what you find!
Thanks,
George