NB. If the script is broken, in worst case the whole application form can refuse to render or render extraneous elements, so copy-pasting needs to be done with care, and vendor's instructions followed closely. Compatibility of the script with company's job ad pages may need to be checked.
Several services can be added one after another. Please, note, that Google Analytics is supported directly, so there is no need to include custom scripts to enable it.
The following is the "Settings" > "Custom scripts" section, which is accessible only by company's main users:
For example, after adding Giosg chat we shall see: