Hello, it depends on which browser you use. If you use Chrome, do the following steps in order

1. Click on ... from the upper right corner

2. Select the setting

3. Type the password in the search field

4. Click on the flash from the Google Password Manager section

5. Enter the site name .researchgate

6. After seeing the name researchgate, click on the right arrow

7. Your username and password are visible

good luck

Meanwhile, other browsers are almost like this