1. How to remove right sidebar in simple post? 2. How to remove description in photogallery?

1. To remove the right sidebar in the single post, you can add the following code to the Header Code (Dashboard > Customize > Custom Code):

<style>
.single-detail .side-bar.span4 {    display: none; }
.single-detail .main-content.span8 { width: 100%; }
</style>

2. To remove the caption in the Photogallery , you can add the following code to the Header Code:

<style>.carousel-caption { display: none; }</style>

Hope this helps !