remove sidebar content on posts pages

Hey there Harmoney,
I looked at your site for you and this should fix what you need done.

.single-post #sidebar {
display: none;
}

Simply put this code into your css editing plugin such as Jetpack or put it into you child theme css. If you need to learn how to make a child theme simply click here https://codex.www.ads-software.com/Child_Themes and youll be setup in no time.

If you need anything else feel free to ask anytime. Hope this helps