Using predefined text in new posts

Put your code in backsticks (see the lines below the text area when you write your post here!) and then maybe we will understand what you are asking.

It is possible.
Depending on what is set in your Options > Write, i.e simple or advanced controls, you can edit the edit-form.php or the edit-form-advanced in the wp-admin folder, by inserting your text in the textarea div. (Or you can do it in both files.) In the advanced form it would be around line 100.

It has nothing to do with php. Just do what wrote in my previous post.
In a text editor open the files, e.g. wp-admin/edit-form-advanced.php and go the the line 100. It will look something like this:

<div><textarea rows="<?php echo $rows; ?>" cols="40" name="content" tabindex="5" id="content"><?php echo $content ?></textarea></div>

then copy your text and insert it like this:

<div><textarea rows="<?php echo $rows; ?>" cols="40" name="content" tabindex="5" id="content"><?php echo $content ?><a target="_blank" href=""><img src="http://dinobaby.net/wp-content/" alt="Bods">
Text</a> From <a href="http://www.bodsforthemods.com " target="_blank">Bodsforthemods</a>
</textarea></div>

Save the file. You can do the same thing in the edit-form.php if you are using the simple control for writing posts.

Glad it worked out 🙂
Have fun!

That is an excellent solution moshu.

Is it somehow possible only put a predefined text into this textbox if it is still empty?

Many thanks

Your solution is the best way for my purposes, since there is no click necessary at all.

The only problem with your solution is, that every time as the user edits the post the hardcoded text will be added again.

oda lehet betenni egy if-et?

O.k. Thanks anyway.