Newly Featured Offers will automatically appear in one of the top 3 slots in both the Offers main listings page, and in the top 3 slots in the listings page for the category you have posted in.
However, these top 3 slots are limited so you won't stay there forever. As other Freelancers feature their Offers, your Offer will gradually move out of these top 3 slots.
However, wherever your Offer appears in the listings below the top 3 slots it will still clearly be flagged as Featured. Plus, if your Offer is returned in a user's search results and is one of the three most relevant Featured Offers for that search, it will appear in the top 3 slots in the search results.