Hardiness Zone: 7a
Jennifer from Eugene, OR
You didn't mention how old the manure is, so you'll want to find out from your friend before using it on your plants.
Your neighbors are right. Fresh manure is considered "hot", which means it is still releasing high amounts of nitrogen compounds and ammonia into the soil as it breaks down. This can burn the roots of young plants and inhibit the germination of seeds, so it is usually recommended that manure be cured for at least 6 months before using it in the garden. Goat and rabbit manure is milder so curing is not necessary.
One way to cure manure is by hot-composting it. A hot manure pile heats to a temperature of at least 150ºF. This kills off any seeds that might have passed through the animal's system undigested, and it also reduces the likelihood (however remote it may be) that any pathogens remain active in the manure-a comforting thought if your going to be applying it to edibles.
Well, I'd get it off your plants before it cooks them.
Is it this year's or last. If it's lasts it's cured, but you still want to get if off your plants you only need a little mixed with dirt or compost. Like if you were planting a 6inch potted plant, you would mix a partial trowel full with the dirt at the bottom of the hole in which you were going to put the plant, of course it would be aged manure.
You can use unaged/uncured to make a hot box for lettuce etc in winter in a cold frame but you dig a hole fairly deep, probably 16-18 inches, put in hot manure, cover with dirt, small layer of compost and set in plants. The manure warms the soil as it cures which is why it's called hot, but won't contaminate the plants if it's deep enough.
If you borrow a spud fork and mix it in well, like half-and-half with dirt, it will be fine and won't burn them, but do keep a clear zone at least 4" around the stem. I would take it off and do the mixing, then stockpile it in the back yard in a fenced pile, to use this fall as topdressing 4" thick.