How do I add a movie to

I don't think I did but I've been on IMDb for nearly 18 years so I may have forgotten 😀

On the previous version of the website it was easy to add a film to this list but I haven't found a way of doing so on the new version, even with the help of lists FAQ

On the new version, it (Add to Watchlist, now with a downarrow) is under the trailer, to the right:

As with the old version, it can take a moment to populate custom lists.

Yes I've seen the add to watchlist icon, thank you but I don't want to add to watchlist but to my movies pending, which is another list

And you waited for the custom lists to populate?

When you switch to the old version (link at top of title page), do you see that list there?

If not, are you logged into the proper account?

Yes, on the old version I can add films to this list easily. That's what I do while the old version is still accessible but soon it won't be anymore

Do you have some sort of strong pop-up blocking?

Do you get the selection box on the new version after clicking the downarrow?

Oh dear. I just found it using my smartphone. I'll check if I can see it when on my laptop and let you know