When you do something ably, you do it well and with skill — the work gets done, and it looks as if you know what you are doing. It is an adverb, so it sits with a verb: she led the team ably; he handled the questions ably. You will meet it more in writing, news, and school reports than in chat. Friends more often say well, really well, or she's good at it. It is a quiet, slightly formal compliment, not a shout. Though actually, it is stronger than a weak can: it does not only mean the person was able to try; it means they did the thing with real skill. Do not treat it as a fancy spelling of able. Able describes a person or a thing; ably describes the way an action happens.