Hello ​@KYUNGHWAN HONG 

If you have a virtual pass, you must install the Rail Planner app on your smartphone and add the journey in this app. After activation of the pass, you must also activate every journey separately, but it is not necessary to make this in advance, wait until you are sure to travel, but before boarding the train.

To resume, the Eurail/Interail web site is only to buy the pass and reserve seats, but, depending on your trip, you can also make reservations on other sites to avoid fees.

To travel you need the Rail Planner app.

Those 2 trains are not reservable, just add them to your pass and travel, take any seat you wish in your designated class.

All trains you take are called Journeys, and all journeys must be connected to the same Trip in the Railplanner app. An Interrail/Eurail pass can only be connected to one Trip. 

realy thanks a lot for the comments.
how can i prove that i use a ticket,like this?
tickets without seat charges are i can't added on my global pass

also, if i take a train that departs at 23:50 and get off at 08:00 without changing trains,

how many times I have used my Eurail Pass?