How to get Facebook Access Token
1- Go to https://developers.facebook.com/ – and sign in with your facebook account
2- Click on My Apps / Add new app
3- Insert App name and click on Create App ID
4- Go to https://developers.facebook.com/tools/explorer and replace Graph API Expolrer with the app you’ve created.
number 1 Is your facebook app
Number 2 is your page
5- Click Info icon next to the token. to the token and Press Open in Access Token Tool.
6- Press Extend Access Token.
6- Here is your Access Token
Remember, Access token last for 3 months So you need to repeat this from step 4 each 3 months.