Step 1
Go to the Instagram Developers Tool: https://www.instagram.com/developer/ and press Register Your Application

Step 2
Then press Register a New Client 

Step 3
Complete fields, uncheck Disable implicit OAuth and press Register

Step 4
Use your data and follow the link https://api.instagram.com/oauth/authorize/?client_id=CLIENT_ID&redirect_uri=REDIRECT_URI&response_type=token 

Step 5
Press Authorize in the window that appears.

Step 6
After confirmation, you will be redirected to the website you've used on step 4. Just copy the access token.


 

That's all :)