There are several ways to do this but we need some usable sample data. A screenshat is not very useful.
A handy way to supply some sample data is the dput() function. In the case of a large dataset something like dput(head(mydata, 100)) should supply the data we need.
Just cut & paste the output into the message like this
```
structure(list(aa = c(1L, 4L, 7L, 10L, 13L), bb = c(2L, 5L, NA,
11L, 14L), cc = c(3L, 6L, 9L, 12L, NA)), row.names = c(NA, 5L
), class = "data.frame")
```
You may find some useful tips here FAQ: How to do a minimal reproducible example ( reprex ) for beginners