Copy & paste this into Google for Hashidate timetable: global.kyoto.travel 58-pdf
The Kyoto ticket counters are just beside the machines. The staff can speak English & Mandarin (Tourist queue/counters). Tell the staff you want to reserve seats for Hashidate at 10.25 am (or whatever time you picked from the train schedule.), to Amanohashidate. Show your Kansai Wide Area Pass. Hashidate has 4 timings only from Kyoto (8.38 am, 10.25am, 12.25pm, 2.25pm).