Row names showing up as row numbers in R - r

This probably has a simple fix, but I'm relatively new to using R and could use some assistance.
The toy data I'm using for a gene network analysis has rows that look like this:
whereas the data that I've uploaded has rows that look like this:
.
The code I'm using refers to the row names to map on as gene names. I am able to successfully run this analysis, however, the output I end up with has lists of row numbers where there should be lists of gene names.
Is there a simple way that I can convert my data into the toy data format so that the row names are gene names instead of numbers?

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example_data <-data.frame(cod=c(20,20,20,20,20,20,20,40,80,80,80,80,80,240),
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