uCoz: Установка кнопок на страницу новости/статьи

Go to your uCoz website Control Panel and choose Design -> Design management (templates) -> Page with full post text and associated comments:

If you chose any of the non-static positions (see the button settings), place the embed code at any place of the template. Like here:

If you selected the static position, choose the best possible button position. While doing it, pay attention to the $MESSAGE$ variable (or $DESCRIPTION$ for an online store), which displays the article text. As a rule, buttons are positioned next to it:

Be sure to click “Save” and check the results: