If you're an admin of the Facebook page but can't see the "Boost Post" button, there could be several reasons behind it.
First, check whether the page is connected to an active ad account in Meta Business Manager. In some cases, the boost option may not appear if there are issues with the ad account, billing setup, or account permissions.
Another common reason is that the post itself may not be eligible for boosting. Certain types of content, including some shared posts, profile picture updates, cover photo updates, or posts containing restricted content, cannot be promoted through the Boost Post feature.
It's also worth verifying that you have full Facebook access rather than limited task-based access. With the newer Page experience, some users are assigned specific tasks instead of full administrative control, which can affect advertising permissions.
If everything appears to be set up correctly, try accessing the page from Meta Business Suite or Ads Manager. Many advertisers create campaigns directly through Ads Manager, which offers more targeting and optimization options than the standard Boost Post button.
Finally, clear your browser cache, try a different browser, or use the Facebook mobile app to rule out a temporary interface issue. If the problem persists, checking the page and ad account status in Meta Business Manager can often reveal any restrictions or policy-related issues preventing promotions.