Type the frequency a repeater transmits on (the one you listen to). See which way the usual offset goes, what your radio should transmit on, and how access tones work.
Most repeaters only open up when your radio sends a quiet, low tone under your voice. Pick the tone the repeater lists. You'll find it in the repeater directory or on the club's page.
VE6DOK transmits on 442.075 MHz, FM and Yaesu Wires-X, in Lethbridge. Tap below to load it. See the VE6DOK repeater page for its offset and tone. The usual rule shown here may not match every repeater.
Offset: a repeater can't listen and talk on the same frequency at the same moment. So it listens on one frequency and transmits on another. The gap between them is the offset. On 2 m that's usually 600 kHz, on 70 cm 5 MHz, on 1.25 m 1.6 MHz, and on 6 m usually 1 MHz (sometimes 500 kHz).
Plus or minus: "minus" means you transmit below the repeater's output, and "plus" means above. Most radios pick the direction for you on 2 m. On other bands, set it yourself.
Tone (CTCSS): a sub-audible tone, 67.0 to 254.1 Hz, sent with your voice. It keeps the repeater from opening on noise or on stations from the next town. Your radio needs to send the tone. Turning on tone squelch so you only hear the repeater is optional.
DCS: a digital code (like 023 or 754) that does the same job as a tone. If a repeater lists DCS, set DCS instead of a tone.
Digital repeaters (Wires-X/C4FM, DMR, D-STAR) still use offsets, but they have their own access settings. A C4FM repeater set to "AMS" will usually also pass plain FM.
Local coordinators can differ. These are the common Canadian and Alberta patterns. Always check the repeater directory or the club's own listing for the exact offset and tone before you key up.