Here's an idea of a setup to demonstrate this ability for the JRI: get
ten of your friends or family to go with you, so you can demonstrate
with a statistically significant sample. Each person throws a pair of
fair six-sided dice ten times while you do your "blessing", and they
"win" each time he throws "snake eyes" (both ones). Each of your
subjects should have about a 1/3 chance (yes, I know that's not exactly
right) of getting snake-eyes at least once. If your ability is real,
you should be able to get a far better-than-random number of them to
"win". I'd put the cut-off at six of the ten, but I'm not with the JRI
so you'd have to work out the exact numbers with them. You could
easily replace the dice throwing with other random events, and the
numbers of tests and percentage of "wins" would need to be adjusted
accordingly. Surely it's worth ten of those special memories to prove
your ability.
As far as I can tell, you can't do any sort of test online, unless you
are able to also "bless" yourself. Or maybe you can find a single
friend to bless, who is willing to participate in a test. It won't
be sufficient to truly prove anything, but maybe that would be enough
to let you know whether it's worth going ahead with a JRI test.