2000 jeep grand cherokee

OK so my sister hooked some jumper cables up backwards on my jeep yesterday. we replaced the battery with a new one but my jeep wont start it cranks none of the gauges work and there is a symbol on the dash of a key with a slash through it there is also a noise coming from the fuse box under the hood from number 38 but don’t know what this fuse or relay goes to