How to make reservation for SunQpass?

Online or by phone?
If phone, does the operator speak english?

My first day will go to Beppu straight from Airport.
So I need any reservation for this line?

If yes, how can I book in advance or just walk in will do?

Thank you!

Pass web mentioned all.
http://www.sunqpass.jp/english/use/index.html

If FUK to Beppu is "Nishitetsu Bus" need booking before.
http://www.nishitetsu.jp/en/highway_bus/
http://www.atbus-de.com.e.jo.hp.transer.com/
https://global.atbus-de.com/route_lists/?locale=en
FUK is in Fukuoka pref.
Beppu is in Oita pref.
Last stop "Beppu Kitahama/別府北浜" is nearest JR Beppu(rail) stn.
https://goo.gl/maps/HCUnsiLRGqT2
https://s22.postimg.org/k3vqsbpqp/beppu_kitahama.png

JP page :
http://www.nishitetsu.jp/bus/highwaybus/rosen/toyokuni.html
Bus name is "Toyonokuni-gou/とよのくに号" about 50 seats.
Bus route :
http://jik.nishitetsu.jp/map?f=maproute&f_list=0003,511440,03&ftei_typ...
Map zoom out and in by "-" ,"+" minus,plus buttons upper right.

https://global.atbus-de.com/route_lists/
I tried this link but there is system error after click search.

Is the website allow us to make reservation?
It stated reservation must be done at least one day in advance, can I make the reservation via web before I collect the ticket?

Thanks!

I could reach "Step 2" by random date now.
https://s14.postimg.org/9wf1li6y9/cp_01.png
https://s14.postimg.org/rnv9dpbqp/cp_02.png

Reserved date is within 2 month from today.
Selected right all?

If so may Software problem
https://global.atbus-de.com/pages/SitePolicy/
or server error (by maintenance or) retry later.

If still cannot be send e-mail about sever respons.
https://global.atbus-de.com/pages/SpecificTradeLaw/

Got it now.

I saw the payment is 3190yen, and proceed to input credit card details. I will be buying sunqpass and I still need to pay for the bus fares?