If you're using Hotel Master theme, please read this : https://goodlayers.ticksy.com/article/12190/ 

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How to get instagram Access Token

1.) Go to this url and click "Register Application" 

https://www.instagram.com/developer/

2.) Click "Register a New Client" button

3.) At the details section, fill the Application Name / Website URL / Valid redirect URIs and Contact email

4.) On security tab, deselect the "Disable implicit OAuth" option and click register

5.) Open this link after you replace the "CLIENT_ID" and "REDIRECT_URL" with the one you registered and click "Authorize" button

https://api.instagram.com/oauth/authorize/?client_id=CLIENT_ID&redirect_uri=REDIRECT_URL&response_type=token&scope=public_content

6.) After clicking the authorize button, your browser will be redirect to the url with access token.

http://localhost/xampp/splash.php#access_token=xxxxxxxxxxxxxxxxxxxxxxxxxxxx

You can copy your access token out to be used in the instagram widget.

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Ref. https://www.instagram.com/developer/authentication/