Sidebar problems

You need to adjust the theme style file to float the elements in to the correct locations.

Do you have any coding abilities?

You’ll need to locate style.css inside of your themes folder. Generally located in wp-content/themes/yourtheme/style.css

I’ve already tried to change the locations of the elements, but because there are so many in my css file I don’t know where to begin or where to look.

For the sidebar I used this code:
#sidebar {float:right; width:300px; min-height:60px; }

But for the rest of the content of my blogpage I don’t know what I have to change.

Here are some example codes:

.home_post_box { float: left; margin: 25px 0px 0 0; width: 244px; height: 258px; position: relative; }
.home_post_box img { width: 244px; height: 258px; }
.home_post_box .home_post_title {font-family: 'Raleway', sans-serif; font-weight: 300;  position: absolute; bottom: 10px; left: 10px; width: 130px; font-size: 12px; color: #fff; text-transform: uppercase; background-color: #fff; padding: 3px; border-radius: 2px; }
.home_post_box_last { margin-right: 0; }
.home_post_title a { color: #222; text-decoration: none; }
.home_post_title a:hover { text-decoration: underline; }

.blog_box { float: left; margin-top: 25px; }
.blog_box .left img { width: 614px; height: 337px; border-radius: 5px;  }
.blog_box .right { font-size: 14px; width: 290px; background-color: #fff; padding: 15px 15px; height: 307px; }
.blog_box .right h3 { font-size: 20px; margin-top: 0; font-weight: normal; }
p.blog_date { margin-bottom: 20px; }
.blog_box .read_more { display: inline-block; font-size: 13px; color: #fac600;  padding: 1px 1px; }

You’ll have to use an inspector in a modern browser to figure out which elements you need to target.

Thank you for the very fast answers, but I’m affraid I don’t understand what you mean exactly.

Here is a very helpful post from Andrea R

Wow, I think this is exactly what I need ??
Thank you very much!