You can offer the same price for all of the influencers by clicking on the block to the left which will select all influencers, then select the dollar sign ($) to set your offers.
Once you click on “Set your offers” you will be able to set the price for all of these influencers for your campaign. Furthermore, you can select the currency for your offer.
If you want to offer a different price for each individual influencer, you can click on the influencer’s profile and go to the “Campaign” tab. You will be able to enter “Your Offer” and then click “Save”.