We'd need either an exact brand and model number of that PSU, or a clear photo of the specifications label, to be certain. The amount of power (500W) is sufficient, but some 500W PSUs are great, some are terrible.
@beyondlogic points out that it has 2 6-pin connectors. (side note: I couldn't find any info on it, where did you find the PSU info?) If you do get a card with a single 6-pin or dual 6-pin, you're fine. If you get a card with a single 8-pin, you will also be good, but you have to get a dual-6-pin to single-8-pin adapter. This is safe because the 6-pin connectors are meant for a maximum of 75W each, and the 8-pin is meant for a maximum of 150W.
I'm a little hesitant on the ASRock cards, though, as their coolers tend to require the fans to spin up faster. The XFX model that runs $129.99 has a single 8-pin connector.
https://pcpartpicker.com/product/tF648d/xfx-radeon-rx-570-4gb-rs-xxx-video-card-rx-570p427d6
Still, we need to get the details from your PSU to be absolutely sure that it will handle it.