You have ability to manually create a conversion. In order to manually create a you will need to find a click for which the conversion will be created.
Clicks can be found and filtered for in the Click report, once you find the desired click, you will click on the record of it and use Create conversion button.
In the opened modal, you will
Select a conversion type - that conversion will be created with
Fill amount - this field is needed to fill only if the conversion type on the offer is Percentage (so conversion can be created with amount derived from the e.g. order amount)
Select a conversion status - that conversion will be created with
Fill optional parameters - these fields can be added to the conversion, if you wish to track any additional parameters
Once all information are filled, you will confirm create of the conversion by Create button.
