Die Bump Question

[Codcake]

After I earn a die bump, when can I opt to use it?

Must I announce that I will use a bump prior to making my check?
Can I use it after my (or someone else's)roll to ensure the successful check?

ALSO
Does location matter?
Do I need to be at the same location to assist another player?
Can anyone use it from any location for another's check at any location?

Thank you in advance.

[Eliandra Giltessan]

You can use your die bump after you roll, and you can use your die bump to help anyone at the table regardless of location.

[Axoq]

It's a Blessing of You!

[MidnightLich]

Wow, you can use it after you roll? That's awesome.

(continues hoarding die bumps)

[James McKendrew]

And if a character dies in-game, for three die-bumps (which can come from anyone at the table), the character comes back to life after the scenario is over and receives rewards as usual.