This will work for any language you have a syntax file for, but I’ll use R as the example.
1. Open an R file, and on the plugins menu, click “Word Complete”
2. Type a couple of letters e.g. rn and then press ctrl+space (default word suggest keyboard combination) and hopefully an auto-suggest popup menu will appear.
3. If nothing seems to happen, be sure you have configured R with the R syntax file (see previous post), otherwise you may need to do some further configuration.
3.1 Go to Tools > Plugins > Customize Plugins > Word Complete (be sure it has a check) > R and double check the various settings, also verify the keyboard short cut assigned under the keyboard tab.