I can't connect the field group table with the button,without making entity

Hello guys,I have 2 questions.Firstly,I designed a button panel and put 3 buttons like below:
1
then,When user click on button,Field Form will open another page,but I can’t create link or connection between button and Field form.It seems be really easy but I couldnt make.
Secondly,Another problem is taking input from user.
I have tried to adding field Form like below:
111
but ı dont want to creaate Entitiy.I wanna just make form then when user entering username password and upload file which has .txt extension,then I want to use username passwword group and posts in the file.But It always give entity connect exception ? How can I write this program?I dont waant to make entity just taking username password and

Hello @erhan_56_94

Could you clarify what do you mean by:

I can’t create link or connection between button and Field form

Do you have any problems with opening another page by button click?

Secondly,Another problem is taking input from user.

Could you clarify the task in more details please? What is the purpose of this form?

But It always give entity connect exception ?

Could you share a stacktrace?

Regards,
Daniil

Hello again,
There will be 3 buttons. When I press one of them, a Field group table will be opened asking the user for user name, password group name.And there is File upload button below them.user can upload text file.And I would like to make all of them without making entity class because when user entering username,password,groupname and text file,program send these informations another program.
Regards,
Erhan.

Okay, so what problem did you met?

so,I can’t make this program always something give errors.How can make button which clicked open another page and this page contains “username” field “password” field “group” field and
“FILE UPLOAD” field without making any entities