Step 1 : Log into your WordPress Dashboard and navigate to Posts > Add New

Step 2 : Change the Post format to Gallery

Step 3 : Upload Gallery images at the Post Meta Box section.

Post Meta Box

Gallery Image : Click on “Select or Upload Images” button and upload a single image.

Slider Pagination : Enable/Disable slider pagination.

Slider Auto Slide : Select Yes to slide automatically.

Slider Direction Arrows : Select Yes to show slider direction arrows.

Slider Effects : Select effects for slider.

Step 4 : Select your preferred sidebar in the dropdown list and position to show on your post. Leave empty for default settings

Step 5 : Insert a custom title and choose a banner type.

Step 6 : When you are done, go ahead and update your page and it should look like this.