Triangle shaped spout filters have three hook points two at top one at bottom Some find it dificult to fit.
Insert bottom hookfirst in slot gently push down top of the filter this will slightly bend and its top hooks should drop in top slots job done. To remove to clean push down top pulling away so top hooks come out lift filter out, or use tooth brush while its in situe with water to gently clean off calcium build up once a month or every two weeks in hard water area.

I also hear/read, my Kettle boils for 6-8 secs can i adjust to boil shorter?

Your lucky they do, its to ensure any untoward bacteria (air,/water borne are killed off, ) Africans in villages have to wait 10-15 minutes to ensure nasties are killed off.

Bob uk, September 2018