Login to your Control Panel
Go to Gallery > Add Gallery/Images > Add New Gallery. Here you will name the gallery you will be uploading your images too. If you are adding images to a previously created gallery, skip this step.
Select your image files from your computer, or drag a batch of images (you can include .zip files) and drop them in the queue to upload
Click ‘Start Upload’
Once the upload is complete, open the post or page you wish to add the gallery to. If you're adding images to an existing gallery, you can stop, as the newly uploaded images will automatically appear in the gallery selected.
In the post/page editor, click the green block button in the tool bar
Select the type of display you would like
Next, click the ‘What would you like to display’ tab and select the gallery you wish to display
Next you may move forward and adjust the gallery settings for this gallery (these are unique settings for this gallery only. Global settings are set under Gallery » Gallery Settings) under ‘Customize the display settings’, and under ‘Sort or Exclude’.
When you are finished, click ‘save’ and the gallery will be added within your post as a thumbnail preview
Update or Publish the page or post to save your changes.