How can I attach a flexible dryer hose attachment?

What seems to be the problem???

I assume that you mean it keeps falling off. You need a dryer hose clamp to tighten it to the vent. Any hardware store should have them for a few dollars.

Here’s an example:

https://www.lowes.com/pd/whirlpool-2-pack-3-9-16-in-to-4-in-dia-steel-adjustable-clamp/1000140453?cm_mmc=shp-_-c-_-prd-_-app-_-google-_-pla-_-174-_-laundry-_-1000140453-_-0&gclsrc=aw.ds&&gclid=CjwKCAjw4ZTqBRBZEiwAHHxpfjRIQzPIR8L6Tvbnhq3aZyIhXWpd-WIsL2HF9fs8UaUEH8bOkJpyShoCQC4QAvD_BwE

You need a vent cuff and clampd.

AAAWWWWW.......Stephanie mine was all messed up I actually bought semi rigid hose and it worked so much better than cheap foil that keeps ripping here is video https://www.youtube.com/watch?v=7yQXmq_BdUY

I recently replaced mine and found the hose had to be on snug before tightening the clamp. Make sure it is long enough, too.

'Best wishes in your new home. Keep those questions coming!