Quick question about paying visafee for h1b and h4 applicant

We are on h1b and h4 visa and planning to get visa stamping.
We are little confused about the new visa scheduling website so have few questionsin regards to that.

We are planning to pay the visa fees but not sure how this new system works. We are three people for stamping - 1h1b and 2 h4 applicants.
Eacch of us a seperate profile created so question is how can we pay the visa fee together as we need some confirmation number from the profile.

Can someone explain step wise process?