Peter
Unfortunately it is not currently possible to delete or rename a feature set using the Online portal.
Feature Sets were reintroduced for backward compatibility with older (pre V3.0) releases of SLP Online and are intended to allow one to group related feature in order to ease selection of commonly used features during issuance of custom licenses i.e. those not issued from SKUs. (Feature Sets cannot be used when creating SKUs.)
If renaming this Feature Set is a major issue for you, as a workaround, using our own management tools we can rename it, provided you send an email to support@inishtech.com with your account details (not username or passsword) together with the existing and required name of the Feature Set to be changed.
This can only be done provided there have been no licenses issued with this Feature Set included.
--John