Step definition is added after "Text fields" in there parent container. Example
# Artifacts
## test_case #1234 - My test title
### Test definition
| Title | My test title |
| ... |
#### Text field title
Text content
#### Steps definition
##### Step $STEP_NUMBER
###### Description
$DESCRIPTION
###### Expected results
$EXPECTED_RESULTS
Example of the step definition field:
#### Steps definition
##### Step 1
###### Description
Open browser and type...
###### Expected results
Page is loaded