Featured Image On Wordpress

I have a little problem... when I want to show the featured image on my posts, the chosen size isn't working (the photo is shown in it's own size). And I want the featured Image to

Solution 1:

Put the php code add_theme_support( 'post-thumbnails' ); on functions.php under the theme directory.

WordPress cutting thumbnails while uploading the file, so you have to enable the feature first then upload the image.

Solution 2:

Put this code add_theme_support( 'post-thumbnails' ); in function.php file

Solution 3:

Select Post option,at right side bar corner,you will find the option as Featured images changes and updates,select and update the image which you require.

Else try with this Code format: the_post_thumbnail(); set_post_thumbnail_size( 50, 50);`add_image_size( 'single-post-thumbnail', 590, 180 );