How do you change the filter in a holmes cool mist

Page 2 of the manual has it is words.

https://manualzz.com/doc/52322507/holmes-hm7808-cool-mist-humidifier-owner-manual

https://www.google.com/search?q=change+filter+on+Holmes+HM7808

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That model number doesn't show up on Sunbeam's site. The only thing you get is a Cool Mist filter. But, this owner's manual in the attached link might be close.
http://demandware.edgesuite.net/aamb_prd/on/demandware.static/Sites-sunbeam-Site/Sites-sunbeam-Library/default/v1425041848701/documents/instruction-manuals/SCM3755C.PDF

, this cool mist tower is ideal for medium rooms. It provides a refreshingly cool, invisible mist, as well as a digital humidistat which offers precise humidity control for your optimal comfort.

I got this off the Sears website so either the room you're trying to make humid is too large, or the humidistat needs to be set properly. Also make sure there is plenty of water in the tank.

attached link for user manual hope this helps
Holmes Owner Guide Cool Mist Humidifier HM7204 ManualsOnline com

the little hose from the tank to the top is clogged

This page has 18 pdf user manuals they are only 1-2 pages each open them in adobe reader till you find the one you need wish i could be more help
http://www.holmesproducts.com/Manuals.aspx

first make sure the unit if off first then take the tank off and then tank the rest off of the base. once you take the part with the fan off the filter goes right in there. if you have any other questions please let me know.

I had the same problem if you dissasemble the unit you will probably find a capacitor between two blue wires has blown out

I have the evenflo cool mist humidifier, model # 758100. There should be a model number on the unit. As far as replacement filters, you can buy the Holmes humidifier filter, model # HWF62. It's compatible with Evenflo. I bought a 2-pk at Target for $15.99. Hope this helps.