In order to activate the button "I like" on my own site from the social network "VKontakte", in the appropriate settings it is necessary to specify the so-called API ID.
Without it, the button will not work.
Being on the main page of your personal account "VKontakte", go to the section "My settings".
At the end of the page with settings, pay attention to the link "Developers" and go on it.
On the opened page we click on the section "Authorization and widgets for sites".
From the presented widgets we choose "I like".
In the "Site / Application" field, select "Connectnew site". We fill in the "Site name" field, register the address of your site. The main domain of the site will be automatically subscribed. Click on the "Save" button and send the code from the image.
Then, from the "Code for paste" field, copy the digits apiId and paste them into the mandatory field of the "I like" button settings in the site administration panel.