Is there any tool I can integrate to design a dashboard? How can I integrate "Dashboard" into my Wisej 2.5.26 version?

If you have a license that allows you to use premium extensions, you can use the DevExpress Dashboard with Wisej 3 https://www.nuget.org/packages/Wisej-3-DxDashboard/3.5.17?_src=template

For Wisej 2, there is no devexpress dashboard extension so you would have to integrate it yourself as a third-party widget.
Some links to help you with that:
https://wisej.com/support/question/implement-devex-dashboard
https://wisej.com/support/question/third-party-widget-integration