Permission: Settings management
You can create Neo4j indexes in Graphlytic settings page. See description of indexes in Neo4j documentation.
Left menu - settings
See panel "Indexes"
In panel "Indexes" click on button Create
Write label of node which you want to create constraint for
Write property of node which you want to create constraint for
Select type of constraint
INDEX - means common index
INDEX_UNIQUE - means unique constraint (see description of unique constraint in Neo4j documentation)
You can delete existing constraint.