It depends upon on what you intend to do with the final output of your image e.g post online or produce prints. Ideally you should edit using ProPhoto because it has the widest gamut. However, you really need to know how to adjust colours correctly. Otherwise when you convert down to sRGB for the web you may clip the gamut and create colour shifts that might produce some funky hues. If you're not familiar with using ProPhoto then I recommend using Adobe RGB or keep it simple and stick to sRGB. To apply a profile across everything, you select it in the operating system's colour management options. Sorry I don't know what those guys do but if they're were to chime in I'd love to know also.
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