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1. To sign into one's account, as on a computer. I'm having trouble logging on to my computer, so I haven't had a chance to check my email yet.
2. To allow someone else to access a computer system. In this usage, a noun or pronoun can be used between "log" and "on." I've having trouble accessing my account from home—any chance IT can log me on remotely?
log someone on (to something)
to allow someone to link (electronically) to a computer system. (This action may be recorded, or logged, automatically in the computer's memory.) I will log you on to the system if you forgot how to do it. I will log on Jill, who is late.
to begin to use a computer system, as by entering a password, etc. (This action may be recorded, or logged, automatically in the computer's memory.) What time did you log on to the system this morning? I always log on before I get my first cup of coffee.
To provide the necessary information to a computer for someone to be allowed to access computer resources: Let me log you on so that you can access the files yourself. You can't use this program until you log on.