Go to marketing, select "Sell Serum". On the right side you will see your active contracts. Chose "Add Serum" to chose serums to add to the contract. Once enough serums are added to fulfil contract, chose "Complete" on the contract in main sell window.I feel really stupid asking this, but I have forgotten how to complete a contract. Yeah, yeah, laugh at the noob...
No reason to make fun of you, the game doesnt do a good job of guiding players through the most basics steps of the business. Updated or more detailed Tutorials or a proper help function would really be a great addition, especially for newcomers.
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