I know, it is not that easy but the realization should start at least.
इड़ा, पिंगला, सुषुम्ना meet @ त्रिवेणी संगम. They meet at third eye. Bathing @ त्रिवेणी संगम means focusing on the third eye while performing homa and/or japa.
One can also imagine self as a speck in the flow of electric current, flowing and concentrating at third eye. Just the way, pilgrimage bath at real त्रिवेणी संगम.
Next time when you visit त्रिवेणी संगम, don’t forget to take a bath by realizing three river flows as इड़ा, पिंगला, सुषुम्ना