Review the importance of encouraging learners to use a word processor whenever it is relevant to do so.
You understand that, while writing longhand is still useful in some instances, using a word-processor is simply the way the vast majority of texts are written today. The integrated spelling, grammar and review tools are not viewed as cheating for anyone that makes a living out of writing texts; why would it be otherwise for a learner? The possibility to move your ideas around on a page and not have to re-write everything as your text evolves is a benefit you prefer your learners have access to (no matter what you teach).
One can easily find several video and text resources to learn how to use word processing software (some free, some have fees). Here are a few :
- Word Processing Training available on Lynda.com ($)
- Using Google Docs, Sheets and Slides
- Apple support videos (could require to add some plug-ins)