Starting with Edit Profile, did you set the FL(s) to download and monitor to ON?
If not do so now and write to the scanner. Also did you assign the FL(s) a quick Key (QK)? If not consider doing so before you write.
Now, with these settings ON and a FL QK assigned to the FL you can enable the FL in two ways:
If you set a FL quick key enter the QK and press E/yes. That should work and will be saved when you exit.
Second, before you write to scanner, in the Profile check the tab Quick Key Status and make sure the FL QK is checked. If not you can check it, save the profile and then write.
Either way should work.
Give it a try and let us know.
Also a good reference with a lot of good tips is Mark Scanners
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Gary