Hi Nawid,
Please check out the solutions below.
1. Please upload the logo from Dashboard HostWHMCS Options -> Header
to fix the issue, not customization -> Header
2. The login template was removed from the theme because Themeforest is not allowed a custom login system, as this is a WordPress Theme. They don’t allow to break the WordPress default login system. That’s why we added the feature to add a login URL and forgot to remove the instruction for the deleted feature. We will remove the instruction in our next update of the theme.
3. No, there is no way.
4. We are sorry to say we didn’t test any plugin. In this issue, you could test with your own based on your needs.
5. In this issue, you could use the custom CSS below.
#backToTop {
bottom: 100px;
}
6. Use an image with a minimum width 1920px
Please Note: Don’t edit anything except the favicon icon using Appearance -> Customize
Edit a page using Edit option http://prntscr.com/plcpi8 of the page and Theme Options http://prntscr.com/plcpwl like Header, Login Page URL, Subscribe, Blog, Shop, etc. using HostWHMCS Options -> Header
Moreover, please check out the Contact form 7 FAQs to fix contact form related issues https://contactform7.com/faq/ or you could also check this out https://www.google.com/search?client=firefox-b-d&q=There+was+an+error+trying+to+send+your+message.+Please+try+again+later.
Best Regards,
ThemeLooks Support Team